Code P0300

Cyber370

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Jhill

I have not checked but does Nissan not have misfire data? If not that truly sucks because it is extremely helpful. Maybe Nissan is hyper sensitive to misfire, better than ford where you can damn near pull the plug and they still won’t throw any misfire code or information (or so I’m toldj.

Zatanna Z

I will steer clear of going to Nissan then! And when I clean the throttle body which part do I spray? And do I let it sit for a minute then wipe it clean?

SouthArk370Z

There's more than one TB-cleaning DIY on this site. If you can't find it using the site's search, go to any big web search engine and add "site:the370z.com" to your search string.

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Zatanna Z

I cleaned my throttle bodies tonight. They were dirty!!

Zatanna Z

I reset the ecu last Thursday. Engine light hasn’t came back on yet

Zatanna Z

Cleared the other code but p0300 came on today I truly don’t believe it’s misfiring. The performance is good

Cyber370

You probably wouldn’t feel slight intermittent misfires. You would need a real time scanner that can register individual misfire counts on each cylinder while driving, especially under load and WOP. It’s the only way to know what’s really going on.


Sent from my iPhone using Tapatalk

__________________
"That’s when you know you’ve found somebody special. When you can just shut the f*ck up for a minute and comfortably enjoy the silence.”-Mia (Pulp Fiction)

Zatanna Z

Gotta link to a scanner I can buy?

Cyber370

Any OBD2 scanner with realtime scanning feature should work. But you need to make sure that it is capable of providing/recording individual cylinder misfire information. I believe the scanner needs to have Mode 6 decoding capabilities, not sure.

I don't have a link to any particular scanner but you can Google it. I know the Autel brand of scanners have several with Mode 6 capabilities.

Hope this helps.

__________________
"That’s when you know you’ve found somebody special. When you can just shut the f*ck up for a minute and comfortably enjoy the silence.”-Mia (Pulp Fiction)

tjlazer

How often does this code pop up on your Z? A lot of us have this randomly but not very often

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Jhill

Google icarscan from launch. Gives full oem access to full vehicle, you’ll thank me later.

Jerterh

So Ive been getting this code most more often recently, Changed plugs bc im on 125k miles. Still getting code. I have berks hi flow cats, not sure if they need to be swapped out or what. Then also i saw that could be clutch/ flywheel, which i am also still on the factory clutch/ flywheel at 125k. So now i basically feel like im chasing an endless problem. On one single occasion i had a p0304 come up but only once did that happen. Also my start ups are very weak and stumble, I feel like this could be due to the cats being clogged but i wouldnt think they would be clogged already. Open to any advice.

Josies370z

hey guys

any updates on this? i recently starting throwing the same code. 2010 370z 70000 miles with berk hfc, stillen G3, and nismo exhaust with a Ecutek tune are the only mods currently. Clutch/flywheel replaced at approx 50,000 (CSC failed, tune and clutch/flywheel done at Specialty Z). It was running fine until about a week ago when it threw a code. idle is slightly rough but seems to run ok but i can tell its slightly off. check engine flashes and remains on and at one point would flash and disappear but now its just on all the time. changed the spark plugs with oem plugs, cleaned both TB's, didnt make a difference. My next moves are to clean the MAF's and re-inspect the plugs. Guy at the auto store said to check the gaps of the plugs and the coil connections that they may not be making good contact and recommended the contact gel they have, i wasnt sold on the 2 things he mentioned as im assuming the plugs would be pretty accurate from the dealer, possibly the coils but would be a hard to determine. Dont know where to go from there so im looking for any input?? thanks!!

Duci22

Recently had my engine rebuilt, the after install it started to throw the infamous P0300 code. Of course the thought was something was not put back together correctly within the engine. After checking several things...plugs, injectors, coil packs, cam sprockets, O2 sensors. I found the the fuel pump assembly had completely come apart in the tank. After replacing the fuel pump and clearing the code, the code is gone. Idles perfect and runs smooth without throwing the code.

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